<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="./font-awesome-4.7.0/css/font-awesome.css">
    <style>
        .fz50{
            font-size: 50px;
            color: red;
        }
    </style>
</head>
<body>

<i class="fa fa-camera-retro fa-5x fz50"></i>
<i class="fa fa-free-code-camp fz50" aria-hidden="true"></i>

</body>
</html>